Bump @ng-select/ng-option-highlight in /frontend in the ng-select group

Bumps the ng-select group in /frontend with 1 update: [@ng-select/ng-option-highlight](https://github.com/ng-select/ng-select).


Updates `@ng-select/ng-option-highlight` from 20.4.1 to 20.4.2
- [Release notes](https://github.com/ng-select/ng-select/releases)
- [Changelog](https://github.com/ng-select/ng-select/blob/master/CHANGELOG.md)
- [Commits](ng-select/ng-select@v20.4.1...v20.4.2)

---
updated-dependencies:
- dependency-name: "@ng-select/ng-option-highlight"
  dependency-version: 20.4.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: ng-select
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

frontend/package-lock.json

@@ -107,7 +107,7 @@
     "@mantine/core": "^8.3.5",
     "@mantine/hooks": "^8.3.5",
     "@mantine/utils": "^6.0.22",
-    "@ng-select/ng-option-highlight": "^20.4.1",
+    "@ng-select/ng-option-highlight": "^20.4.3",
     "@ng-select/ng-select": "^20.1.0",
     "@ngneat/content-loader": "^7.0.0",
     "@openproject/octicons-angular": "^19.30.1",